6 What is a BACnet object? BACnet uses an object-oriented approach for the network view of a device. An "object" (e.g. analog output) has a set of "properties" (e.g. operating limit, status, etc.) and represents a functional behaviour. Each object has a unique object_identifier within a device. Object: Over 20 standard objects The device object, however, has an object_identifier that is unique systemwide. Domotica ed edifici intelligenti Università di Urbino 6

7 Structure of a BACnet object A BACnet object consists of a set of properties. Properties are used to parameterise the object's functionality and present the results. A property of an object is either REQUIRED or OPTIONAL. Property: Required Optional Proprietary The Object_Identifier, Object_Name and Object_Type properties are mandatory in every object. The data type of a property can either be simple (e.g. integer, string), or it can have a complex structure. The definition of proprietary objects and proprietary properties is permitted and governed by the BACnet standard. Domotica ed edifici intelligenti Università di Urbino 7

9 Standard objects (continued) Flexible event and alarm handling of any property content: EventEnrollment object Time and receiver dependent event and alarm distribution in the system: NotificationClass object Read and write large quantities of data: File object Grouping of objects and properties in a device: Group object Grouping of objects and properties in a network: Global Group object Representation of any closed-loop control block: Loop object Representation of an application program: Program object Domotica ed edifici intelligenti Università di Urbino 9

28 Extendability of the BACnet protocol The BACnet protocol is designed such that it can be extended at any time: Extensions by the BACnet standard committee (SSPC-135) Proprietary extensions by vendors The following extensions can be made: Objects: new objects and/or properties New services This makes BACnet a safe investment for the future! Domotica ed edifici intelligenti Università di Urbino 28

30 BACnet BACnet Example PXM20 needs the current value from the BACnet Object AI (Analog Input) AI has various Properties AI One of the Properties of the AI is its Present Value We make use of the Read_Property Service Domotica ed edifici intelligenti Università di Urbino 30

35 Functions: Time-dependent switching The time-dependent switching function is: dependent on date, weekday, time of day unless the current date corresponds to an entry in the exception list BACnet realises this function with two objects: The schedule object provides a weekly schedule List of switching times with values (binary, analog, multistate) Link to the objects to be influenced Exception list also with switching times and values The calendar object is a list of exceptional days It can be referenced by the exception list in the schedule object Domotica ed edifici intelligenti Università di Urbino 35

36 BACnet scheduler objects The schedule object plays the central role! Linking of schedule object and commanded objects via references The commanded objects can be local (in the same device as the schedule object) or in a different device on the network. Separate schedule objects are required for different data types (binary, analog and multistate). Analog Value Object Commanded Object Schedule Object Schedule Object Calendar Object Exception Period Domotica ed edifici intelligenti Università di Urbino 36

47 Interoperability Openness in Three Steps EXCHANGEABILITY Possibility of exchanging devices within a system without changing the functionality and behaviour of the system Openness INTEROPERABILITY Capability of compatible devices to implement functions and applications within an overall system and to ensure them COMPATABILITY Possibility of allowing devices to physically communicate with each other based on a standard Domotica ed edifici intelligenti Università di Urbino 47

49 BACnet Concepts BACnet Interoperability Building Blocks: Data sharing Alarm and Event Management Scheduling Trending Device and Network Management Definitions of functions which are important in a (Building Automation und Control System) BACS to be able to operate and monitor the special objects Domotica ed edifici intelligenti Università di Urbino 49

51 BIBBs More Details A.1.12 BIBB - Data Sharing-COV-B (DS-COV-B) The A device is a user of data from device B A.1.3 BIBB - Data Sharing-ReadPropertyMultiple-A (DS-RPM-A) The A device is a user of data from device B and requests multiple values at one time Domotica ed edifici intelligenti Università di Urbino 51

54 Conformance Testing Manufacturer must supply a PICS with a device PICS contains a list of standard objects and services used by the device Device must be then tested for conformance to verify the correct implementation of these standard objects and services Testing is now underway in Europe Domotica ed edifici intelligenti Università di Urbino 54

59 BACnet Ethernet and IP networks Use of the existing cabling in the building Fastest technology (Some vendors already offer high-end controllers with this connection) Advantages International standard Various media (UTP, coax, FO) Protocol implemented in chip No further development tools Disadvantages Relatively high costs Not adapted to any particular system Will not work with IP V6 Domotica ed edifici intelligenti Università di Urbino 59

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